Spiral or helix (4)
I believe the answer is:
coil
This clue is a double definition.
'spiral' is the first definition.
(I know that spiral can be written as coil)
'helix' is the second definition.
(synonyms)
(Other definitions for coil that I've seen before include "Twist" , "Wind in a series of loops" , "Wound length (of rope)" , "Series of concentric circles" , "Wire winding" .)